| http://www.w3.org/ns/prov#value | - Each time the vehicle travels a predetermined distance, e.g. 10 m, the first vehicle position dead-reckoning section 19a calculates vehicle position X- and Y-coordinates and vehicle bearing ?? by equations (1) to (3) and by using the actual vehicle position (before traveling the 10 m distance) stored in the actual vehicle position storage section 33 (Steps 201, 202).
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